[CC Professional 2nd computer doesn't accept key]

Hi I have had to replace hard drives problems on 2 computers. I reinstalled CCleaner Professional on both. CCleaner, accepted the key, worked on 1 computer, on the other CCleaner would not accept the key you sent me. That same key worked on 1 but not the other. I have uninstalled, reinstalled, downloaded new CCleaner and installed it. I cleaned my registry after every uninstall. How can I resolve this problem. I had purchased  CCleaner Professional a few years ago and like its function. I am using windows 10 (legal version from ms) on both computers. The same software exist on both computers. These are very basic computers.  CCleaner Professional did work on the 2nd before I replaced the hard drive. Please help me and give me instructions to fix this problem  Ask me if you need more information. Thank you.

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[CCleaner registry scan vs other reg scanners]

I've been using wisecare 365 reg scan for a few months, and I've now tried the CCleaner reg  scan.

I get 2 greatly different results. the wise reg scan finds 0, 1 or 2 problems. none of the find were significant problems.

CCleaner finds 64 problems. I haven't deleted any registry items. I've been using CCleaner to delete files for quite a few years,

but never tried the registry cleaner until the other day. I do not believe I have 64 registry problems (I hope I don't).

 

My question is why the discrepancy ?

 

I can't find what filters CCleaner or wise 365 uses to determine a registry problem.

 

I am using Win7, at the latest upgraded level.

 

Thank you for any replies.